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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d0f1f49b3e1d7e68205a59b07bd9c1fa4d4fd058d5e8e6fc0aede184bd4a64' 
  AND token = 'e/UEiJKYLEtsUqbjndf5QJJqTwphRM6bQdJl6XwuA0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}